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Co-existant medial collateral ligament injury following transient patellar dislocation – observations at MRI
  1. John F Quinlan (johnfquinlan{at}yahoo.com)
  1. Cappagh National Orthopaedic Hospital, Finglas, Dublin 11, Republic of Ireland
    1. Cormac Farrelly
    1. Cappagh National Orthopaedic Hospital, Finglas, Dublin 11, Republic of Ireland
      1. Gabrielle Kelly
      1. School of Mathematical Sciences, University College Dublin, Belfield, Dublin 4, Republic of Ireland
        1. Stephen Eustace
        1. Cappagh National Orthopaedic Hospital, Finglas, Dublin 11, Republic of Ireland

          Abstract

          We report on a series of patients who were diagnosed as having had a transient LATERAL patellar dislocation by MRI. The images were reviewed with specific reference to the medial collateral ligament (MCL), a heretofore undescribed concomitant injury.

          Eighty patients were diagnosed on MRI as having had transient LATERAL patellar dislocation. Their mean age was 23.9+/-7.5 years. Forty patients (50.0%) had co existent MCL injuries. These injuries were classified as grade 1 (n=20), grade 2 (n=17), and grade 3 (n=3).

          These results suggest that MCL injury commonly accompanies transient LATERAL patella dislocation, most likely due to a shared valgus injury. It appears to occur more commonly in male patients and if unidentified may explain both delayed recovery and persistent morbidity in more severe cases. In this setting, without specifically excluding co-existent MCL injury, the current vogue for early rehabilitation should be adopted with caution.

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